diff --git a/java/com/google/android/apps/authenticator/AuthenticatorActivity.java b/java/com/google/android/apps/authenticator/AuthenticatorActivity.java
index 93cd0c3..1cf1d5f 100644
--- a/java/com/google/android/apps/authenticator/AuthenticatorActivity.java
+++ b/java/com/google/android/apps/authenticator/AuthenticatorActivity.java
@@ -56,6 +56,7 @@
 import android.view.View.OnClickListener;
 import android.view.ViewGroup;
 import android.view.ViewGroup.LayoutParams;
+import android.view.WindowManager;
 import android.view.accessibility.AccessibilityEvent;
 import android.widget.AbsListView;
 import android.widget.AdapterView;
@@ -288,6 +289,10 @@ public void onCreate(Bundle savedInstanceState) {
     totpCounter = otpProvider.getTotpCounter();
     totpClock = otpProvider.getTotpClock();
 
+
+    // Block screenshots
+    getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
+
     setContentView(R.layout.main);
 
     toolbar = (Toolbar) findViewById(R.id.authenticator_toolbar);